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Showing papers in "Journal of Lubrication Technology in 1970"




Journal ArticleDOI
H. Christensen1
TL;DR: In this article, the elastohydrodynamic problem of normal approach of two spherical bodies is studied and the lubrication and elasticity equations governing this type of motion are established.
Abstract: : The elastohydrodynamic problem of normal approach of two spherical bodies is studied and the lubrication and elasticity equations governing this type of motion are established. Numerical solutions to the general case accounting for elastic deformation of the bodies and pressure dependent viscosity are presented. (Author)

119 citations






Journal ArticleDOI
TL;DR: In this paper, a theoretical and experimental investigation of quasi-harmonic friction-induced vibration is reported, where the vibration is of near-sinusoidal form and is solely governed by dynamic friction forces.
Abstract: A theoretical and experimental investigation of quasi-harmonic friction-induced vibration is reported. The vibration is of near-sinusoidal form and is solely governed by dynamic friction forces. However, the friction-velocity curve must be of a particular shape for the vibration to occur. The amplitude of the quasi-harmonic vibration is shown to increase with sliding velocity until oscillation ceases at some upper velocity boundary. The introduction of suitable damping will quench the vibration entirely. The vibration can exist at high sliding velocities and as a consequence may influence the operation of automatic transmissions, brakes, and clutches.

73 citations





Journal ArticleDOI
TL;DR: In this article, the design, development, and application of a pin-on-disk tribometer for the measurement of friction and friction-induced vibration is described, and careful isolation techniques eliminated many of the errors in measurement which were associated with vibration arising from the apparatus or the surroundings.
Abstract: The design, development, and application of a pin-on-disk tribometer for the measurement of friction and friction-induced vibration is described. Careful isolation techniques eliminated many of the errors in measurement which are associated with vibration arising from the apparatus or the surroundings. The use of acceleration, velocity, and displacement transducers in association with a one-cycle sequence triggering circuit and other electronic devices permitted the accurate measurement of kinetic friction forces in the presence of friction-induced vibration.


Journal ArticleDOI
TL;DR: Elastohydrodynamic solution for ball torque spinning without rolling in nonconforming groove, showing increase in torque with stress and spinning and decreasing conformity as mentioned in this paper, showing that the ball torque increases with stress, and decreases with spinning.
Abstract: Elastohydrodynamic solution for ball torque spinning without rolling in nonconforming groove, showing increase in torque with stress and spinning and decreasing conformity



Journal ArticleDOI
TL;DR: Linear analysis of damped flexibly mounted rolling element bearings influence on dynamic rotor unbalance response, including optimum support characteristics, is presented in this paper, where the authors present a linear analysis of the impact of the damped flexible bearing bearing on the unbalance of a dynamic rotor.
Abstract: Linear analysis of damped flexibly mounted rolling element bearings influence on dynamic rotor unbalance response, including optimum support characteristics


Journal ArticleDOI
TL;DR: In this paper, a steel ball bearing with high temperature fatigue life tested with synthetic paraffinic oil, fluorocarbon and polyphenyl ether was used for high temperature testing.
Abstract: Steel ball bearing high temperature fatigue life tested with synthetic paraffinic oil, fluorocarbon and polyphenyl ether


Journal ArticleDOI
TL;DR: Ball bearing simulation by rolling disk apparatus, emphasizing surface slip and related thermal effects alterable by geometric expansion as discussed by the authors, was used to simulate a rolling disk for ball bearing lubrication simulation.
Abstract: Ball bearing lubrication simulation by rolling disk apparatus, emphasizing surface slip and related thermal effects alterable by geometric expansion


Journal ArticleDOI
TL;DR: In this paper, a small eccentricity analysis was performed for a bearing having two feeding planes, each of which is assumed to be a line source, and numerical results were obtained for a range of bearing number, pressure ratio, feeding parameter, and orifice recess volume by means of a digital computer.
Abstract: A small eccentricity analysis was performed for a bearing having two feeding planes, each of which is assumed to be a line source. Numerical results were obtained for a range of bearing number, pressure ratio, feeding parameter, and orifice recess volume by means of a digital computer. Steady-state load and attitude angle were obtained, as well as stability data. Stability decreased markedly with increasing recess volume; moreover, for large recess volume and low bearing number, an increase in pressure ratio decreased stability. There was no correlation between stability and steady-state attitude angle for any of the cases studied. Fair agreement was obtained with available experimental data.